Improvement in clutches



A. SWINGLE.

CLUTCHES.

No.1 71,063. Patented Dec. 14. 1875.

g p E move together as one.

UNITED STATES PATENT QFFIGE.

ALFRED SWINGLE, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN CLUTCHES.

Specification forming part of Letters Patent No. 17 L063, dated December14, 1875; application filed October 29, 1875.

To all whom it may concern Be it known that I, ALFRED SWINGLE, of SanFrancisco city and county, State of California, have invented'aFriction-Pulley and ldo hereby declare the following description andaccompanying drawings are sufficient to enable any person skilled in theart or science to which it most nearly appertains to make and use mysaid invention without further invention or experiment.

My invention relates to a novel construction of a friction-pulley; andit consists ofa pulley mounted to turn loosely upon a shaft which has adisk moving longitudinally upon a feather, so that by means of a sort ofdouble knee lever or toggle the face of the disk canbe moved closelyagainst the side of the pulley, and, by its friction, cause the two toThese knee-levers are operated by a sliding clutch, and are made tostand at a small angle between the disk and the bar against which theyact, so that when the strain comes upon the pulley it will tend to bindthe flange closer to it.

Referring to the accompanying drawing, for a more complete explanationof myinvention- Figure 1 is a longitudinal section, showing the interiorconstruction of the pulley. Fig. 2 is a View, showing the position ofthe kneelevers.

A is a pulley, loosely mounted upon a sleeve, B, this sleeve beingfitted with the difl'erent parts of the device, and then keyed to theshaft. At one side of the pulley is a collar, 1), which holds the pulleyto its place, and this collar is adjusted by means of a- -nut, d, whichturns upon a thread cut on the sleeve, so as to hold the pulley more orless closely to the friction-disk. A disk, 0, somewhat smaller than therim of the pulley, moves upon a feather upon the shaft B, so that it canbe moved up against the side of the web of the pulley inside the rim,and upon the side opposite to the collar b.

When pressed closely together the friction between these parts will besufficient to revolve the two together; but when the disk is drawn backitwill leave the pulley free to revolve loosely upon its axis.

In order to move this disk into or out of contact with the pulley Iemploy two or more knee or toggle levers, D, which operate be tween thedisk and a support, E, secured firmly to the shaft at a sufficientdistance outside the disk.

In the present case I have shown two of these knee-levers secured so asto press upon the disk at points opposite to each other, as shown.

Each of the levers D are hinged together in the middle at t, and areconnected with the disk and the support E by a ball-andsocket joint. Athird arm, F, is pivoted to the central joint of each pair of arms D,and, extending down, they are connected with the slides G, as shown.These slides are simply extensions, projecting from the clutch El alongeach side ofthe shaft, so that when the clutch-ring H is moved by itslever it will cause the slide G to draw the arms F downward, and thismovement bends the jointi between the levers D, thus shortening thedistance between the disk 0 and the support E,

and retracting the disk from the pulley, so as to allow the latter tomove independently.

When it is desired to cause the pulley and shaft to turn together, itwill only be necessa-,

ry to move the clutch-ring H toward the pulley, when the arms G, whichpass through the support E, will move the inner ends of thelevers F,until these levers stand nearly or quite at right angles from the shaft,and by this movement the levers D will be brought into a straight line,thus forcing the disk against the pulley.

In order to insure sufficient friction to prevent slipping I have placedthe levers D so that they stand at a slight angle, or bracing toward thedisk, being heldin this position hya spring, m, and, when the strain ofturning is brought upon them, the tendency will be to force the diskstill harder against the pulley by the straightening of the levers, andbringing them into a line parallel with the shaft.

By this construction I am enabled to provide a very efficient and simplefrictional device for driving loose pulleys.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s-

1. The knee-levers D, operating between the disk 0 and the support E, incombination with shaft, so esto farce the disk against the vpuitheoperating-arms I and the sliding clntehleys" asthey are 'mb 'ved mo eDearly parallel ring H, substantially as and for the purpose with' it,substntia llj' as herein described.

herein described. ALFRED SW'INGLE.

2. In combination with the loose pulleys-A, Witnesses:

disk 0, and the support i E, the levers D D, GEQ. H. SIEQNG, when placedin a line at an angl'ewith the J. BOONE.

